Why does a very low calorie intake slow down weight loss?
Quite simply, your body goes into 'starvation mode'. This mechanism, which is thought to have evolved as a defence against starvation, means the body becomes super efficient at making the most of the calories it does get from food and drink. The main way it does this is to protect its fat stores and instead use lean tissue or muscle to provide it with some of the calories it needs to keep functioning. This directly leads to a loss of muscle, which in turn lowers metabolic rate so that the body needs fewer calories to keep ticking over and weight loss slows down.
Of course, this is the perfect solution if you're in a famine situation. But if you're trying to lose weight, it's going to do little to help you shift those unwanted pounds.
So how many calories should I have to prevent starvation mode?
Unfortunately, there's no single answer to this question. As everyone's metabolism varies in the first place, so too will the point when the body starts to use muscle to provide it with calories in a 'famine-type' situation. That's why WLR works out suitable calorie intakes for each member on an individual basis and never lets you opt to lose more than 2lb a week, which would require a severely restricted calorie intake. In other words, if you stick to the calorie intake recommended by WLR, you can be sure your body won't go into starvation mode.
As a general rule though, most nutrition experts recommend never going below 1,000-1,200 calories a day if you're dieting on your own.
It's also worth bearing in mind that the body doesn't suddenly 'enter' and 'leave' starvation mode, like crossing the border from Devon into Cornwall. It's a gradual process - so you don't need to panic if you do go below your calorie intake very occasionally.
** 25 days is plenty of time for your body to think it is starving.
The good news is you can increase the amount of muscle you have by increasing the amount of exercise you do. This in turn will rev up your metabolism so that you can lose weight one final time on a slightly higher calorie intake than you've perhaps been used to.
For more on how to boost your metabolism, see my related article,
8 Ways to Speed Up Your Metabolism
The main site:
Dieting and Metabolism